Information by Business Segment - Reconciliation of Segment Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Reconciliation of segment assets to total assets
Total consolidated assets	$ 4,232,895	$ 4,246,966	$ 4,177,992
Operating properties lease liabilities included in segment assets	33,550	$ 34,346
Segment assets
Reconciliation of segment assets to total assets
Total consolidated assets	3,628,212		3,585,114
Operating properties lease liabilities included in segment assets	33,550		35,327
Non-operating property assets
Reconciliation of segment assets to total assets
Total consolidated assets	245,828		345,518
Other assets
Reconciliation of segment assets to total assets
Total consolidated assets	$ 325,305		$ 212,033